. >> a child's captor, jimmy lee dykes, is dead now. but investigators will not say whether he was killed or took his own life. the ordeal came to an end after the fbi sneaked a hidden camera into the underground bunker. lucky little guy. >>> a new twist in the sensational murder trial of the arizona woman who confessed to killing her on and off again boyfriend. >> she took the stand saying she acted in self defense and portrayed herself as a lifelong victim of abuse. abc's brandi hitt has the latest details, good morning, brandy. >> reporter: good morning. jody arias returns to the stand this morning. she admitted to killing her boyfriend. now jurors are expected to hear arias' explanation what happened the night of the murder. >> did you kill travis alexander on june 4, 2008? >> yes, i did. >> reporter: in a surprise move, jody arias took the stand in her own defense and explained to the jury why she brutally murdered her ex-boyfriend travis alexander. >> he attacked me. and i defended myself. >> reporter: speaking quietly with her ha